If you allow yourself to be a commodity at work you are putting yourself into a position to be easily replaced.
This means if many other people can do the same job you are doing, it makes it easy for them to bring in someone who might work faster, or cheaper or both.
Distinguish yourself in a way that you do things better, or different than anyone else and it makes it much more difficult to replace you.
Too many people are looking for a way to fit in at their organization, you should look for a way to stand out.
Have a great day!